ECSS-E-ST-35-06C Rev.2


unit of solid matter with observable size


  • NOTE 1 Various methods for defining its size may be used and are dependant upon the measurement technique.
  • NOTE 2 For the manual method the apparent maximum linear dimension of a particle in the plane of observation as observed with instruments such as optical, electron, or atomic force microscopes is the particle size.
  • NOTE 3 For the automatic method, the equivalent diameter of a particle detected by automatic instrumentation is the particle size.
  • NOTE 4 The equivalent diameter is the diameter of a reference sphere having known properties and producing the same response in the sensing instrument as the particle being measured.
  • NOTE 5 A fibre is considered a particle, see clause 3.2.6


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